Add metadata retrieved from the `context` to the user agent when a ne… #5098

Job	Run time
run-determination	1s
check-outdated (./)	16s
check-config (./)	16s
check-style (./)	1m 13s
check-formatting (./)	13s
check-license-headers (./)	19s
build (internal/arduino/discovery/discovery_client)	15s
build (rpc/internal/client_example)	23s
build (commands/term_example)	27s
	3m 23s

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